Yusuf's passion for security technologies and
solutions is evident in his 17 years of industry experience and numerous certifications. Yusuf's extensive
experience as a mentor and advisor in the security technology field has honed his ability to translate highly
technical information into a straightforward, easy-to-understand format. If you're looking for a truly
comprehensive guide to network security, this is the one!
Steve Gordon
Cisco Systems, Inc.
Vice President, Technical Services
Remote Operations Services and Learning@Cisco
Introduction
The Internet was born in 1969 as the ARPANET, a project funded by the Advanced Research Projects Agency
(ARPA) of the U.S. Department of Defense. The Internet is a worldwide collection of loosely connected networks
that are accessible by individual computers in varied ways, such as gateways, routers, dial-up connections, and
through Internet service providers (ISP). Anyone today can reach any device/computer via the Internet without
the restriction of geographical boundaries.
As Dr. Vinton G. Cerf states, "The wonderful thing about the Internet is that you're connected to everyone else.
The terrible thing about the Internet is that you're connected to everyone else.
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